Question

Allele that determines phenotype in heterozygote (e.g., Y)

a) Dominant allele
b) Recessive allele
c) Codominant allele
d) Carrier allele

Answer 1

In heterozygotes, the dominant allele determines the phenotype. The recessive allele is only expressed in homozygous genotypes.

Step-by-step explanation:

A recessive allele causes a phenotype that is only observed in homozygous genotypes and not in heterozygous genotypes. In heterozygotes, the dominant allele determines the phenotype. The recessive allele will only be expressed if an organism has two copies of the recessive allele. For example, in the case of blood type, the dominant allele for blood type A will determine the phenotype even in the presence of the recessive allele for blood type O.